The ice on the river had been completely lifted, so the lathes began their work again.

Although the lathe is still at the level of three generations, but its accuracy has been greatly improved, the lathe, the need to process some key parts on the steam engine, this can now start processing, I don't know how many need to be processed, in order to reach the practical standard.

And where is the difficulty in the steam engine, the main safety issue, that is, the safety of the boiler, this boiler, to make, is simple, but also simple, because it is a container for boiling water, it can be said to be troublesome, that is also troublesome that is to prevent explosion, because once the boiler is unqualified, it is easy to explode, besides, this steam engine is the need for high-pressure steam to drive, so the quality of this boiler must pass.

In order to make this boiler, Yang Heng once again picked up his old profession, which was a blacksmith.

"You all pay attention, look at the process of making this boiler, remember, I asked you to pay attention to the process, but not to let you learn my speed, after all, the hammer I use is something you can't pick up, why, don't you believe it?"

Yang Heng looked at a blacksmith in front of him and asked, because a look of disbelief appeared on his face.

"Yes, owner, isn't this hammer just an ordinary hammer, although it seems slightly larger than the one we use, but we can also use it, it's just a little tired."

"Well, I appreciate your courage and skepticism, but I don't really like your distrust, since I said it. That won't lie to you. Come. Take turns and take a look to see if you can pick up the hammer. ”

After finishing speaking, Yang Heng gently placed the hammer in front of him.

"There's nothing you can't afford to hold, it's just more than thirty pounds," said the blacksmith, who wanted to pick up the hammer with ease.

"This, how is this possible, why can't I hold it......" The blacksmith was astonished, he could only shake the hammer with the handle, but he could not carry it, not even a little bit.

"Boss, what kind of material is your hammer made of, and how much does it weigh?" "This, let me tell you, this hammer weighs more than 200 catties, and it is made of extraterrestrial meteorite, and the density of this meteorite is more than ten times greater than the steel we have here. Forget it, I'll tell you this. You won't understand it too much, but now that you understand, take a good look. ”

The hammer in Yang Heng's hand was like a heavy press, falling again and again, crushing the impurities in the steel under his hand, and slowly, pieces of steel were formed in his hands.

Moreover, Yang Heng is to beat out the pieces of iron plates, and then roll them up, so that they can be burned in the furnace, there are several furnaces on the white side, this is also a matter of no way, if the pouring steel plate is up to standard, it will not be done in this way.

"Come, a few of you, each with a pair of tongs, clamp this plate, remember, your goal is to level it and move it with my hand."

With Yang Heng's instructions, several blacksmiths clamped the steel plate in Yang Heng's hand, and after a while, Yang Heng clamped out a piece of the steel plate in the furnace, and then unfolded it and connected it to the steel plate in front, and finally, a super-large steel plate was successfully made.

"You all see it, yes, this is the method of joining a large steel plate, but this is also difficult, and even, when you learn it, maybe this method is useless, but, rest assured, in a long time, it is still impossible to eliminate, at least this technique is necessary for seams."

Indeed, when Yang Heng has not yet researched electric welding, this seam method must still be used, and even for a long time it must be used, electric welding, this thing is very simple, but it is to use electricity to melt the welding rod, and then the weld that needs to be welded is also burned some, so that the weld will be welded very securely, however, as a welding rod, the production is still very troublesome, it needs to consider the material of steel products, what kind of material, what kind of welding rod is needed, This is a difficult subject, and there is also solder, which is also a subject, and it is necessary to ask the blacksmith in the mountain to study it with the Taoist.

A few days later, Yang Heng made a boiler by riveting, and the riveted seams were sealed with glue, which were also specially made of burn-resistant and high-temperature resistant glue, at this time, Yang Heng was quite relieved of the boiler he made, but so, he couldn't use it directly, or he needed to test it, test it, how to carry out it, first of all, you need to build a very thick stone house, and then put this boiler inside, and let people add coal to it through a small hole.

And there is no measure on the boiler, yes, there is a small pipe, and there is an iron ball blocked on the top of the pipe, which is basically the boiler can have more than five atmospheres of pressure, and then the iron ball can be washed away.

In fact, Yang Heng didn't know how much air pressure was needed for this boiler, but five air pressures should be enough, if this test was successful, then the pressure gauge would be made next.

If this test is not successful, then the boiler will explode, and even in future tests.

"Goo Dong Goo Dong," Yang Heng could hear the sound of his own heartbeat, if this test was not successful, he didn't know how to improve the road, he looked at a worker in front of him carefully pushed the coal into it with an iron plate, whenever he pushed some coal, he quickly hid in a bunker underground, which was a sturdy stone house, Yang Heng was not at ease, so he also designed a bunker in front of the house, just to make the people who added coal to it safer.

"Boom ......" Finally, a stream of steam rushed up to the sky, looking at the result, it should have been successful, but at this time, Yang Heng was still not very relieved, and did not let the person in front of him come out, but let the steam finish spraying before letting him come out.

Is this done, no, Yang Heng still needs to continue to increase the weight of the iron ball, his goal is to reach seven air pressures, at least to be able to reach the lowest pressure of any air press he saw in his previous life, naturally this air pressure is the pressure that only large air compressors have.

After the same worry twice, Yang Heng finally put down the heart that he had raised, in this way, as an important part of the steam engine, it was a success, and the next part was other parts, and the blacksmiths in front of them, their task was to build a boiler many times, and to test it many times, naturally, Yang Heng didn't believe that they could reach the standard at one time, and it would explode, so it would still take a few times, otherwise, this thing would be too simple.

The boiler has been successfully developed, but then it will be on the machine, it is not ready, the next thing that needs to be done is the pressure gauge, the pressure gauge, the main attention is that one is the sealing problem, one is the quality of the spring, and the other is the scale of the pressure gauge.

The gears in the pressure gauge, and even the pointers, are very simple, that is, they are completely made manually, which is also quite simple.

"Boss, what are you?" When Yang Heng took out his masterpiece in the past few days, the workers on the scene wondered, what is this thing for, a glass plate, inside is a pointer, there are some scales on it, and the scale is one to ten, and a pointer points to a position.

"This is a barometer, which is used to detect the pressure of the steam, and once the boiler is successfully tested, such a pressure gauge will be installed, which is to let the workers see clearly what the steam pressure is now.

And at the same time that Yang Heng was making the pressure gauge, there was already a boiler that was fried, which was a must.

"Boss, I'm sorry, we were in too much of a hurry and didn't really come according to your request." "This means that you know the reason, right?" In fact, Yang Heng knew from the time they made the boiler that their process was a little too economical, and Yang Heng estimated that it was mainly in the problem of making the steel plate, and some impurities in the steel plate were not squeezed out, which was the cause of the explosion.

"Yes, owner, when we were making steel plates, some of them didn't take enough time and times to make them, and some of them forgot the weight of your hammer." (To be continued......)